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Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Does your car have the factory amp system?
Is this replacement radio compatible with the amp?
Did the speakers work with the original radio?
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Thanks for the update. Your adapters may be wrong or the radio is just not compatible with the amp since the speakers do work on the original radio. Do you need the wire diagram to check the signals from the radio to the amp and speakers?
All I can do is go to there website and overlook what they say which is surprising quite often WRONG. Volvo nor any other car maker lists out which aftermarket radios work in their vehicles. If you do not know about wiring then there is no use in a diagram. It would be best to contact Alpine to see if they have another unit to try so you can confirm its not a bad radio first off.
Glad you got it resolved.